I deal with this all the time. A little less since I started the Prozac. But I also have take a small dose of atavan when things get bad and that also helps. My advice is to not google symptoms. That's only made me feel worse. Try taking an asprin next time you have that pain. When I get these pains or sensations that I'm convinced is a heart attack I take an asprin, I take an atavan, and then I try to calm myself down by just remembering it's anxiety. If you have a Primary Doctor, talk to them about your fear, they may be able to give you some information on things to look out for if it really was an emergency. The most important part is not letting that panic take over. As sufferers of anxiety we are HYPER vilgilant when it comes to detecting changes in our body. So a twinge or a pain that someone else might not even pay attention to, we seem to see it as a sign of something being seriously wrong with our bodies.